Investigating in a systematic way the efficiency of surface patterning to enhance adhesive strength at PDMS - acrylic adhesive interfaces, and comparing, at fixed geometry, rigid and deformable patterned surfaces, we have shown that for not too large aspect ratio of the patterning, a major contribution to the enhancement of adhesive strength was due to the deformation of the patterned substrate. For larger aspect ratios, soft patterns are altered when the contact is established, and then rigid patterns become more efficient, probably because the more complicated interface leads to enhance dissipation inside the adhesive when the peel front passes.
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